Composite bit



Dec, 16, 1924.

C. C. HANSEN GOMPOSITE BIT INVENTOR Cau/e Hansen m5 ATToN 1 a ,f Ho o //l- .IIIIIII' Filed Marh 8, 1923 l El? L Qd?. p

Patented Dec. 16, 1924.

UNITED snyifras4 1,519,135 PATENT ol-r-'1c1s.

' CHARLES C. HANSEN, 0F E ASTON, PENNSYLVANIA. ASSIGNOR T0 INGERSOLLvBAND COMPANY, F JERSEY CITY, NEW JERSEY, A CORPORATION 'OF NEW JERSEY.

COMPOSITE BIT.

. Application led March 8, 1923. Serial No. 623,587.

y Tp all wlwm t may concern:

Be it known that I, CHARLES C. HANSEN, a citizen of the United States, a resident of Easton, county of Northampton, and State of Pennsylvania, have invented a certain Composite Bit, of which the following is a specification accompanied by drawin s.

This invention relates to core dri s aud particularly to the bits used for cutting more` or less solid cores of rock or other material in the operation of such drills. 'Various types of bits have been employed with core drills in which types loose chilled shot or other abrasive material usually constitutes the cuttingelement. Shot bits using such chilled shot or other material are subject to` considerable wear and require renewal from time to time, and the handling of the loose shot also entails carein the operation of the drill. l

The primary object of this invention is to enable a. core drill to be equipped 'with a removable bit having a renewable cutting element in which abrasive cutting material is embedded in a cementitious b1nder,tlie \whole being in a solid mass so that'the use of loose shot is obviated.

A further object of the invention is to simplify and improve the construction of the renewable cutting bits` and to permit a new cutting element to be substituted when one has been worn down.

With the above and other objects inview my invention consists in the features of construction and operation described in the fol lowing specification and illustrated on the accompanying drawings, forming a part hereof, in whichf Figure 1 is a lorlilgitudinal sectional, elevation of a core dri equipped with my device; and

Figure 2 is a transverse section on the line 2 2 of Figure 1.

Referring to the drawings, I have illustrated the essential parts of a typical Calyx core drill, in which the rotary drill rod A is secured'to-the core barrel plug B, as by means of screw threads. The hollow cylindrical core barrel C is threaded to the lower endof the plug B and a water tube D is threaded tothe upper end of the plu `B.

The core barrel C receives the core in the usual manner.

The core barrel `C is equipped with a destanceQmy improved bit includes a cylindrical body portion F adapted to be threaded to the lower end of the core barrel/C as shown at G so that the outer surface is substantially flush with the outer surface of the core barrel C. .The body F is provided with a depending annular cylindrical pox'- tion H, and imier and outer concentric cylin ders J and K respectively are ladapted to be removably secured on opposite sides of the central portion H. These cylinders J and K together onstitute an extension ofthe body portion 14g, of substantially the same diameter as the body F and the core barrel C. In the present instance the cylinders J and K are secured to the portion H by rivets L countersunk below the outer surfaces of the cylinders J and K.

An annular chamber O of uniform diamen ter is formed between the cylinders J y and K below the body portion F and portion H This chamber is adapted to contain, a mass of. abrasive cutting material P and a binder introduced therein .in any suitable manner so that the cylinders J and K and material P constitute a unitary cutting element. In

` ythis case the abrasive material is a composition including cement and small broken pieces of crushed chilled steel, or Achilled steel shot, or other hard substance.

The cylinders J and K have a plurality of pairs of oppositely disposed openings or holes Q rwhich preferably extend completely through the walls of the cylinders J i and K. The cementitious abrasive mixture is introducedinto the chamber O so that the mixture enters the openings Q. When the mixture has hardened, the mass will be securely held between the cylinders J and K and anchored by the portions which lill the openings Q. The cylinders J and K and the cemen titious mass P form a unitary cutting element and wear down together. During` the drilling, the abrasive cutting material 1s released from the cement or other binder and is acted upon by the rotating cutting element in the same manner as loosely inserted shot beneath a shot bit, except that the cutting material embedded between the cylin-V ders J and K is .itself abrasive and ma assist in cutting the material being drille When. the cylinders J and K and the abrasive mixture have been worn down completely, the body F is 4unscrewed from the being filled with the abrasive composition.

I claim: y In a core drill, the combination of a core barrel and a cutter bit detachably secured to said core barrel, said cutter bit comprising 'a hollow cylindrical body portion/internally vthreaded for attachment to the core barrel and having a depending annular cylindrical portion, inner and' outer cylinders substantially flush with the inner and outer surfaces of said body portion and riveted to said depending portion, and a mass of abrasive and cementitious .material between said cylinders, said cylinders having openings lextending therethrough for anchoring said mass of abrasive and cementitious material, said cylinders and said mass of material together` constituting a replaceable cutting element for said core` drill.

l/In .testimony whereof I have signed this specification.

' CHARLES C. HANSEN. 

